Anterior Tibial Subluxation with ACL Deficient Knees influences the Knee Stability after ACL Reconstruction.
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1 Anterior Tibial Subluxation with ACL Deficient Knees influences the Knee Stability after ACL Reconstruction. RYOTA TAKASE 1), KAZUHISA HATAYAMA 1), MASANORI TERAUCHI 1) KENICHI SAITO 2), HIROTAKA CHIKUDA 2) 1) Dept. of Orthop. Surg., JCHO Gunma Central Hospital 2) Dept. of Orthop. Surg., Gunma Graduate School of Medicine
2 Ryota Takase,MD I have no financial conflicts to disclose.
3 Introduction Anterior tibial subluxation ( ATS ) in standing full extension was occurred in ACL-deficient knees. Almekinders LC,et al. Arthroscopy ATS in full extension was occurred in ACL-deficient knees while maintaining the heels elevated. Hatayama K et al. JOSKAS 2011
4 Purpose To investigate whether preoperative ATS with ACL deficient knees influences the knee stability after ACL reconstruction Materials & Methods Retrospective study 46 patients undergoing ACL reconstruction using semitendinosus tendon Male : 20 Female : 26 Mean age : 27 y. o. ( range 13 to 49 )
5 Lateral radiographs Under general anesthesia Both knees in full extension while maintaining the heels elevated Image intensifier Both femoral condyle were superimposed SOURCE:K Hatayama, 2nd JOSKAS 2011
6 Radiographic measurement 1 Hyperextension angle 2 intersecion ratio = a / b 100 (%) Intersection ratio compared with uninjured knee 5 % ATS ( + ) group Intersection ratio compared with uninjured knee < 5 % ATS ( - ) group SOURCE:K Hatayama, 2nd JOSKAS 2011
7 Demographic Data Preoperative factors Age ( y ) Sex ( Male / Female ) Time from injury Subacute group : within 1 year from injury Chronic group : > 1 year from injury Meniscus injury : Medial MM / Lateral LM Postoperative evaluation Side to side difference ( SSD ) in anterior tibial translation ( mm ) N test Lysholm score Statistical analysis Using Telos Stress Device at 20 Student s t test Χ² test P <.05 was considered significant
8 Results ATS ( + ) group ( n = 13 ) ATS ( - ) group ( n = 33 ) p value intersection ratio ( % ) Age ( y ) Sex ( Male / Female ) 5 / 8 15 / Time from injury ( Subacute / Chronic ) 9 / 4 31 / MM injury 8 ( 62 % ) 9 ( 27 % ) 0.03 LM injury 6 ( 46 % ) 15 ( 46 % ) 0.97 hyperextension angle ( )
9 Results ATS ( + ) group ( n = 13 ) ATS ( - ) group ( n = 33 ) p value Postoperative SSD ( mm ) N test ( + ) 46 % 12 % 0.01 Lysholm score / 13 patients in ATS ( + ) group had concomitant MM injury. 2 / 8 Repair : mean SSD 4.2 mm SSD > 5 mm 0 / 2 ( 0 % ) 6 / 8 Resection : mean SSD 4.6 mm SSD > 5 mm 3 / 6 ( 50 % )
10 Discussions This study showed number of patients with preoperative MM injury was significant larger in ATS ( + ) group ( P = 0.03 ). ATS with ACL deficient knees associates with chondral injuries and meniscal tears. Lucas SM et al. Am j Sports Med 2017 Preoperative ATS associates with concomitant MM injury in ACL deficient knees.
11 Discussions Postoperative SSD in anterior tibial translation was significant difference in ATS ( + ) group ( P < 0.01 ). Postoperative N test ( + ) was significant difference in ATS ( + ) group ( P < 0.01 ). Preoperative ATS was risk factor for early graft failure. Y Tanaka, et al, Ortho JS Med 2018 This study also revealed ATS adversely affects postoperative anterior and rotation stability.
12 Discussions 8 / 13 patients in ATS ( + ) group had concomitant MM injury. Mean postoperative SSD Repair : 4.2 mm / Resection : 4.6 mm Postoperative anterior stability was same difference between MM repair and resection. But the sample size is small. Further clinical research is needed to investigate whether treatment for MM injury with ATS influences postoperative knee stability.
13 Conclusion Preoperative ATS associated MM injury and influenced knee stability after ACLR. References Louis C. Almekinders, John B. Chiavetta. Tibial subluxation in anterior cruciate ligament-deficient knees: Implications for tibial tunnel placement. Arthroscopy 2001; 17: K Hatayama, M Terauchi et al. Sagittal alignement of knee extension in ACL deficient knees. JOSKAS 2011: 36: McDonald LS, van der List JP, Jones KJ, et al. Passive anterior tibial subluxation in the setting of anterior cruciate ligament injuries. Am J Sports Med 2017; 45: Tanaka Y, Kita K, Takao R, et al. Chronicity of anterior cruciate ligament deficiency, Effects on the tibiofemoral relationship before and immediately after anatomic ACL reconstruction with autologous hamstring grafts. Orthop J Sports Med 2018; 6(1).
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